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* ''OS/A+ 4.1'' OSS extended the successful OS/A+ product with additional capabilities for version 4, many of which were arguably ahead of their time. For example, the strict "8.3" naming scheme (eight alphanumeric characters with a three character extension) was replaced by "long" filenames, similar to the Microsoft DOS transition to [[File Allocation Table|VFAT]] in 1995.
However, unlike VFAT, ''OS/A+ 4.1'' disks were not backward compatible with earlier systems; Atari DOS or ''OS/A+ 2.1'' could not read disks formatted by ''OS/A+ 4.1'', breaking backward compatibility. The [[memory footprint]] was larger as well, resulting in insufficient memory to run some popular applications. As a result of these drawbacks, ''OS/A+ 4.1'' did not achieve the market penetration as the earlier product. OSS did reissue ''OS/A+ 4.1'' for a brief period when they decided not to modify ''DOS XL'' for double-sided disk support.
=== DOS XL ===
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